Adsorption characteristics of Cs&lt;sup&gt;+&lt;/sup&gt; onto artificial zeolites synthesized from coal fly ash and diatomite

Johan, Erni; Yoshida, Kohei; Munthali, Moses Wazingwa; Matsue, Naoto; Itagaki, Yoshiteru; Aono, Hiromichi

doi:10.2109/jcersj2.123.1065

Cited by 13 publications

(3 citation statements)

References 19 publications

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“…At the same time, the coexistence of chabazite and Na-P1 zeolite occurs at the sodium hydroxide content above 5%. Te adsorption capacity of Na-P1 zeolite for Cs + is weaker than that of chabazite but stronger than that of N-A-S-H gels [23,24,44,45], which results in the reduction of Cs leaching at a sodium hydroxide content of 10% compared to 5% and 2.5%.…”

Section: Leaching Characteristics Of Sfcmmentioning

confidence: 92%

In Situ Synthesis of Zeolites in Solidified Fly Ash/Cement Matrices with High Na Content: Products, Pore Structure, and Leaching Behavior

Zheng

Bao

Wang

et al. 2022

Advances in Materials Science and Engineering

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Due to its high retention capacity and well durability, fly ash-based geopolymers rich of zeolites are considered to be potential solidified materials for low- and intermediate-level radioactive waste stream. This study mainly focused on the phase transformation, pore structure, and leaching characteristic of Sr2+ and Cs+ in solidified fly ash/cement matrices under different sodium hydroxide contents or sodium nitrate concentrations after thermal curing of 28 d. The results obtained from the experiments indicated that the geopolymers prepared from pure fly ash had the potential to transform into ordered structures at high temperatures of 90°C instead of room temperature, such as Na-P1 zeolite and chabazite. With the increase in sodium hydroxide contents, more sodium nitrate participated in the reaction to form a zeolite phase in solidified fly ash/cement matrices, while the coexistence phenomenon of chabazite and Na-P1 zeolite appeared under the condition of high sodium hydroxide contents of more than 5%. Just a proper number of zeolites can effectively inhibit the leaching of radionuclides Sr2+, as too many zeolites would lead to the increase in porosity, which was harmful to the retention of radionuclides. Solidified fly ash/cement matrices at a sodium hydroxide content of 5% or at a sodium nitrate concentration of 300 g/L obtained the lowest cumulative leaching fraction of Sr2+. Moreover, sodium hydroxide increased the cumulative leaching fraction of Cs+ which reversely decreased significantly with the increase in sodium nitrate concentrations.

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Section: Leaching Characteristics Of Sfcmmentioning

confidence: 92%

In Situ Synthesis of Zeolites in Solidified Fly Ash/Cement Matrices with High Na Content: Products, Pore Structure, and Leaching Behavior

Zheng

Bao

Wang

et al. 2022

Advances in Materials Science and Engineering

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“…This decreases the binding energies of the whole electronic state of C. Spectral analysis of the peak intensity ratio between C 1s and Cs 3d 5=2 reveals that the maximum adsorption capacity of the GO=porous alumina film for Cs atoms in the CsCl solution is 650-850 mg g −1 , which is highly efficient compared with previous adsorbents such as organic molecules, nano structured oxides, and zeolites. [31][32][33] …”

Section: Experimental Methodsmentioning

confidence: 99%

Effective adsorption and collection of cesium from aqueous solution using graphene oxide grown on porous alumina

Entani

Honda

Shimoyama

et al. 2018

Jpn. J. Appl. Phys.

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Graphene oxide (GO) with a large surface area was synthesized by the direct growth of GO on porous alumina using chemical vapor deposition to study the Cs adsorption mechanism in aqueous solutions. Electronic structure analysis employing in situ near-edge X-ray absorption fine structure spectroscopy and X-ray photoelectron spectroscopy measurements clarifies the Cs atoms bond via oxygen functional groups on GO in the aqueous solution. The Cs adsorption capacity was found to be as high as 650-850 mg g %1 , which indicates that the GO/porous alumina acts as an effective adsorbent with high adsorption efficiency for radioactive nuclides in aqueous solutions.

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“…For such a purpose, cesium adsorption apparatus such as KURION and SARRY are used. In these devices, the key collecting material is mainly zeolite and a lot of research has been conducted regarding recovery of cesium [2][3][4][5][6] . Meanwhile, in areas where radioactive substances were spread, decontamination was carried out at many public facilities and individual housing in order to reduce air dose below the standard, leading to the generation of contaminated water.…”

Section: Introductionmentioning

confidence: 99%

Study for the Formation of Sponge-like Ion Exchanger Containing Sodium-form Synthetic Mica and Its Cesium Adsorption Characteristics

Suzuki

Karasawa

2018

J.I.E.

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As an adsorbing material for recovering cesium from radioactive contaminated water, a sponge-like compound was synthesized using sodium-form synthetic mica (Na-TSM) as an ion exchanger which does not contain lithium and is inexpensive and readily available. The cesium adsorption ratio from aqueous solutions was 80% or higher in low cesium concentration region and the desorption ratio was less than 5%. It suggests that synthesized sponge-like material is much adapted as cesium adsorbent.

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Adsorption characteristics of Cs<sup>+</sup> onto artificial zeolites synthesized from coal fly ash and diatomite

Cited by 13 publications

References 19 publications

In Situ Synthesis of Zeolites in Solidified Fly Ash/Cement Matrices with High Na Content: Products, Pore Structure, and Leaching Behavior

In Situ Synthesis of Zeolites in Solidified Fly Ash/Cement Matrices with High Na Content: Products, Pore Structure, and Leaching Behavior

Effective adsorption and collection of cesium from aqueous solution using graphene oxide grown on porous alumina

Study for the Formation of Sponge-like Ion Exchanger Containing Sodium-form Synthetic Mica and Its Cesium Adsorption Characteristics

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